Korg iElectribe, £13.99

Boy were we excited when we first heard about this: it’s a spot-on emulation of the classic Korg Electribe-R groovebox.

You have four percussion synth parts and four PCM synth parts to work with, and patterns can be programmed using the step sequencer. As well as being a fine app in its own right, this was the software that first made people believe that the iPad has a future as a ‘serious’ music-making platform.